DOI:10.1049/ree.1967.0073

出版商:IERE    

年代:1967

数据来源: IET

摘要:

A circuit model of the step-recovery diode is proposed based on the known conduction properties of the device. This model permits analysis of harmonic generation circuits with greater generality than has hitherto been possible and is used to estimate the efficiency and optimum terminating conditions of a high-order frequency multiplier.

DOI:10.1049/ree.1967.0074

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The broad aims of a university course are reviewed and the ways in which these can best be met at the present day are considered. The present structure of the electronics industry within which the students are most likely to find their employment in the immediate future is discussed, and an industry/university course on Product Technology is described. Further education and re-training are discussed. A plea for an improved relationship between industry and the universities is made.

DOI:10.1049/ree.1967.0075

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The Doppler-frequency shift resulting from clutter motion degrades the efficiency of moving target indication (m.t.i.) radar systems. Although the degradation is much less when some compensation methods are used, it still exists because of the finite tolerances of the Doppler-compensation frequency shift. This effect is analysed for single- and double-delay-line m.t.i. cancellers and fluctuating clutter.

DOI:10.1049/ree.1967.0076

出版商:IERE    

年代:1967

数据来源: IET

DOI:10.1049/ree.1967.0077

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The problem of angular resolution is formulated in a statistical decision theoretical context. A tutorial discussion of decision theory and its application to resolution is presented, and an explicit signal processing radar system is derived, the resolving properties of which approach an optimum. Computer simulation tests show that the system is capable of reliably resolving targets as close as a quarter of a 3 dB beam-width in the presence of noise and system errors.

DOI:10.1049/ree.1967.0078

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The general philosophy behind the remote control of lighthouses and the fundamental principles involved in operating such a system where the maintenance of the navigational service is of paramount importance are outlined. The characteristics of plant suitable for remote control and its integration into a system are described. The number of control functions and monitoring facilities required for each item of plant are discussed, together with an outline of a comprehensive scheme designed to accommodate a number of fully-operational stations operating on a group basis. The technical merits and reliability of various systems of communication are considered and a comparison made on an economic basis for rented circuits, the public telephone network and radio links of differing path length. Finally, details are given for a group of stations which are now being brought under remote control as an experiment to establish the feasibility of the scheme and to determine whether there is a significant economic advantage in operating lighthouses in this way.

DOI:10.1049/ree.1967.0079

出版商:IERE    

年代:1967

数据来源: IET

摘要:

Laboratory tests to assess component behaviour in adverse environments are artificial, and designed to be consistent on repetition, but accelerated in attack. They each test for a particular weakness of design or of fabrication. In order to obtain a result quickly it is usual to apply a number of independent test procedures in parallel to as many separate groups of similar components. There are, however, two types of failure where it is advantageous to employ two or more individual procedures in sequence to a single group of components.(i) Where a sequence of adverse conditions, often encountered in nature, can lead to a failure which would not occur where any one of the conditions had been applied above.(ii) Where damage due to one procedure is not apparent immediately, but can be detected readily by the subsequent application of a second procedure.Practical examples of both types of failure are examined in detail. Both climatic environments and mechanical environments are considered, and also the combination of the two. The more specialized cases where the simultaneous application of two or more different procedures is essential, are considered. Such combined tests usually contain also an element of sequence, and these much more complicated cases are considered briefly.

DOI:10.1049/ree.1967.0081

出版商:IERE    

年代:1967

数据来源: IET